That statement contains some truth but is too broad.
In hot weather, many people develop mild ankle swelling because:
- Heat causes blood vessels to widen.
- Fluid is more likely to collect in the lower legs due to gravity.
- Long periods of sitting or standing can reduce the calf muscles’ ability to help pump blood back toward the heart.
For otherwise healthy people, this type of swelling often improves with:
- Walking or moving the legs regularly
- Elevating the legs when resting
- Staying hydrated
- Avoiding prolonged sitting or standing
However, it’s not safe to assume swollen ankles are “not a heart or kidney problem.” Swelling can also be caused by:
- Heart failure
- Kidney disease
- Liver disease
- Chronic venous insufficiency (vein problems)
- Blood clots
- Certain medications (such as some blood pressure medicines)
A healthcare evaluation is important if the swelling:
- Is sudden or severe
- Affects only one leg
- Is accompanied by pain, redness, or warmth
- Occurs with shortness of breath, chest pain, or rapid weight gain
- Persists or keeps recurring
So the headline is partly accurate—summer heat can commonly cause temporary ankle swelling—but it should not be taken to mean that heart, kidney, or other medical conditions can be ruled out without considering the person’s symptoms and medical history.
